A History of Quantum Mechanics


	A History of Quantum Mechanics

invictus

7-20-2007 7:15 AM

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tags:

physics, quantum theory, atom, particles, science

invictus says:

Revisiting & re-clipping some of my old stuff.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/d1d37b49-e9b0-4447-9462-c5272a592272/10F19C81-9747-4557-9722-1EE4F456EF8B/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_Quantum_age_begins.html" href="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_Quantum_age_begins.html" style="font-size: 11px;">www-groups.dcs.st-and.ac.uk</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_Quantum_age_begins.html"><H1>A history of Quantum Mechanics</H1></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_Quantum_age_begins.html"><P align="justify">
It is hard to realise that the electron was only discovered a little over 100 years ago in 1897. That it was not expected is illustrated by a remark made by J J Thomson, the discoverer of the electron. He said 
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_Quantum_age_begins.html"><I>I was told long afterwards by a distinguished physicist who had been present at my lecture that he thought I had been pulling their leg. </I></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_Quantum_age_begins.html"><P align="justify">
The neutron was not discovered until 1932 so it is against this background that we trace the beginnings of quantum theory back to 1859.
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/The_Quantum_age_begins.html">In 1905 <A href="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/../Mathematicians/Einstein.html">Einstein</A> examined the photoelectric effect. The photoelectric effect is the release of electrons from certain metals or semiconductors by the action of light. The electromagnetic theory of light gives results at odds with experimental evidence. <A href="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/../Mathematicians/Einstein.html">Einstein</A> proposed a quantum theory of light to solve the difficulty and then he realised that <A href="http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/../Mathematicians/Planck.html">Planck</A>'s theory made implicit use of the light quantum hypothesis.</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/10F19C81-9747-4557-9722-1EE4F456EF8B/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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